LED emitter and LED lamp having the same

1. A light emitting diode (LED) emitter comprising: a first LED chip string that includes a plurality of first LED chips connected in series; a second LED chip string that is connected to the first LED chip string in parallel and composed of a plurality of second LED chips connected in series; a substrate where the first LED chip string and the second LED chip string are mounted; at least two electrodes electrically connected to the substrate; a high-color-temperature phosphor layer that covers the first LED chip string; and a low-color-temperature phosphor layer that covers the second LED chip string; wherein a total resistance value of the first LED chip string is different from a total resistance value of the second LED chip string; wherein the resistance value of the first LED chip is different from the resistance value of the second LED chip and the number of the first LED chips is different from the number of the second LED chips.

2. The LED emitter as claimed in claim 1 , wherein the first LED chip and the second LED chip have the same resistance value while the number of the first LED chips is different from the number of the second LED chips.

3. The LED emitter as claimed in claim 1 , wherein a material for the substrate is selected from the group consisting of ceramic, sapphire, and metals.

4. A light emitting diode (LED) emitter comprising: a first LED chip string that includes a plurality of first LED chips connected in series; a second LED chip string that is connected to the first LED chip string in parallel and composed of a plurality of second LED chips connected in series; a substrate where the first LED chip string and the second LED chip string are mounted; at least two electrodes electrically connected to the substrate; a high-color-temperature phosphor layer that covers the first LED chip string; and a low-color-temperature phosphor layer that covers the second LED chip string; wherein a total resistance value of the first LED chip string is different from a total resistance value of the second LED chip string; wherein the resistance value of the first LED chip is different from the resistance value of the second LED chip while the number of the first LED chips is the same as the number of the second LED chips.

5. A LED lamp comprising: a casing that includes a mounting space and an opening communicating with the mounting space; a base mounted in the mounting space and having one end thereof connected to the opening for closing the mounting space and the other end thereof provided with at least one first conductive member; a support that is arranged at the base, located at the same side of the base with the first conductive member, and having at least one second conductive member; at least one LED emitter electrically connected to the first conductive member and the second conductive member, and including a first LED chip string that includes a plurality of first LED chips connected in series; a second LED chip string that is connected to the first LED chip string in parallel and composed of a plurality of second LED chips connected in series; a substrate where the first LED chip string and the second LED chip string are mounted; a high-color-temperature phosphor layer that covers the first LED chip string; and a low-color-temperature phosphor layer that covers the second LED chip string; wherein a total resistance value of the first LED chip string is different from a total resistance value of the second LED chip string; wherein the resistance value of the first LED chip is different from the resistance value of the second LED chip while the number of the first LED chips is the same as the number of the second LED chips.

6. The LED lamp as claimed in claim 5 , wherein the first LED chip and the second LED chip have the same resistance value while the number of the first LED chips is different from the number of the second LED chips.

7. The LED lamp as claimed in claim 5 , wherein the resistance value of the first LED chip is different from the resistance value of the second LED chip and the number of the first LED chips is different from the number of the second LED chips.

8. The LED lamp as claimed in claim 5 , wherein a material for the substrate is selected from the group consisting of ceramic, sapphire, and metals.

9. The LED lamp as claimed in claim 5 , wherein the base includes a core rod, a circuit board and a mounting seat; the circuit board is disposed on one end of the core rod and closing the opening while the mounting seat is fixed on the other end of the core rod, opposite to the end with the circuit board.

10. The LED lamp as claimed in claim 9 , wherein the first conductive member and the support are arranged at the mounting seat.

11. The LED lamp as claimed in claim 9 , wherein the base includes a vent pipe; the vent pipe is mounted in the core rod and a part thereof is inserted through the circuit board.

12. The LED lamp as claimed in claim 9 , wherein the LED lamp further includes a cap; the cap is connected to the casing and covering the opening.

13. The LED lamp as claimed in claim 12 , wherein the cap includes a metal threaded housing and an electrical point connected to the metal threaded housing.

14. The LED lamp as claimed in claim 13 , wherein the base includes at least two conductive wires; one ends of the two conductive wires are both electrically connected to the circuit board while the other ends thereof are connected to the metal threaded housing and the electrical point respectively.

15. The LED lamp as claimed in claim 5 , wherein the support includes an axial rod and a support member; one end of the axial rod is connected to the base and the support member is disposed on the other end of the axial rod.

16. The LED lamp as claimed in claim 15 , wherein the second conductive member is arranged at the support member.